Patent GB-358120-A (GB)
Title: Improvements in or relating to coating compositions
IPC: C09D101/02
Filed: 1930-07-05
Abstract: Synthetic resins of the phenol-aldehyde type are plasticized by means of resins of the type obtained by reacting equivalent molecular proportions of a phenol and a fatty oil in the presence of a promoter such as phosphoric acid.  In an example, a plasticizer is formed by reacting tung oil with phenol in the presence of a little phosphoric acid under reflux at 195-205 DEG  C. A weight of phenol equal to that of the reacted product and about one-third as much hexa-methylene-tetramine are then added, and the whole reacted until viscous.ALSO:A transparent coating composition applicable as a solid film or veneer to wood &c. for closet seats is made by treating a cellulose in a gelatinizable form, e.g. pure cellulose, cotton flock, or alpha cellulose, with a plasticized resinous product or the phenol-aldehyde type and kneading the mixture, e.g. by mechanical rolling, until the fibrous structure of the cellulose is completely destroyed.ALSO:A transparent coating composition applicable as a solid film or veneer to wood, metal, &c. is made by treating a cellulose in a gelatinizable form, e.g. pure cellulose, cotton flock, or alpha cellulose, with a plasticized resinous product and kneading the mixture, e.g. by mechanical rolling, until the fibrous structure of the cellulose is completely destroyed.  The resinous product is preferably an artificial resin of the phenol-aldehyde type and as plasticizers there may be used high-boiling solvents such as dibutyl phthalate or tricresyl-phosphate, or a resin of the type obtained by reacting equivalent molecular proportions of a phenol and a fatty oil such as tung oil in the presence of a promoter such as phosphoric acid.  In some cases the excess phenol present in the formation of the phenolaldehyde product may serve as the plasticizer.  In an example, a plasticizer is formed by reacting 150 parts of tung oil with 100 parts of phenol in the presence of 1 part of phosphoric acid under a reflux for about 5 hours at 195-205 DEG  C.  A weight of phenol equal to that of the reacted product and about one-third as much hexa-methylene-tetramine are then added and the whole reacted until viscous.  This plasticized resinous mixture may be converted into a varnish by adding a solvent such as benzol, the varnish so formed being added to cotton flock in the proportion of 2 parts to 1, the mixture being then dried to remove the solvent, heated to partially advance the resin towards its hardened state, and rolled until the fibrous structure of the cellulose disappears.  A lubricant consisting of 2 per cent each of lime and calcium stearate, or carnauba, ceresin or candelilla wax, and a plasticizing agent such as furfural may be added.  Instead of forming a varnish, the plasticized resinous mixture may be kneaded directly with the cellulose. Retardants such as rosin, ester gum or glycerol-phthalic anhydride resinous products may be added, and the cellulose acetate and shellac may also be incorporated.  The composition may be applied in powder or rolled-sheet form under heat and pressure and has the property of being remouldable.  For example, in making a steering-wheel, separate halves of a shell may first be moulded, a core being then enclosed and upon applying heat and pressure the halves will weld together.  A similar method may be employed for air-proof coverings for wire coils for electrical apparatus.  Other specific uses mentioned for the coating compositions are table tops and other furniture elements, doors, interior panelling, and closet seats.